Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2009-05-21
2010-11-23
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S149000
Reexamination Certificate
active
07839191
ABSTRACT:
A DLL circuit includes a coarse delay adjustment circuit and a fine delay adjustment circuit, which further includes a first fine delay circuit and a second fine delay circuit serving as an interpolation circuit. The coarse delay adjustment circuit delays a reference clock signal by a plurality of delay stages so as to provide the first fine delay circuit with two phase signals having the phase difference of two delay stages, which are then converted into two delay signals having the phase difference of one delay stage. The delay signals are subjected to interpolation, thus producing an output clock signal. Due to a reduction of the phase difference in the first fine delay circuit, it is possible to reduce the minimum operation cycle of the interpolation circuit and to thereby increase the maximum operation frequency of the DLL circuit.
REFERENCES:
patent: 6876239 (2005-04-01), Bell
patent: 6937530 (2005-08-01), Bell
patent: 6956418 (2005-10-01), Kwak et al.
patent: 7088159 (2006-08-01), Kwak et al.
patent: 7161397 (2007-01-01), Lee et al.
patent: 7202719 (2007-04-01), Gabato et al.
patent: 7368966 (2008-05-01), Hur
patent: 7388415 (2008-06-01), Lee
patent: 7449930 (2008-11-01), Hur
patent: 7548100 (2009-06-01), Cho et al.
patent: 7605626 (2009-10-01), Hur
patent: 7724052 (2010-05-01), Hur
patent: 7737744 (2010-06-01), Choi
patent: 7750712 (2010-07-01), Ide et al.
patent: 2003/0052718 (2003-03-01), Takai
patent: 2003-091331 (2003-03-01), None
Donovan Lincoln
Elpida Memory Inc.
Foley & Lardner LP
Houston Adam D
LandOfFree
DLL circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with DLL circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and DLL circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4245652